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Comparing ArrayList elements with Hash map Keys

Posted on 2009-07-01
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Last Modified: 2013-12-22
I have a arraylist and hash map .
I want wen ever there is matching in arraylst elemtns and hashmap keys
corresponding vales sud be put in a new list.
The values of HashMap is list.
My given codeis failing somewhere between.
Please check..
import java.text.DecimalFormat;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.HashMap;

import java.util.HashSet;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.Set;
 
 

public class test5

{

	public ArrayList<String> getData(HashMap<String, ArrayList<String>> AMap,ArrayList<String> temp)

	{

		

		System.out.println(" Invloking getData ");

		Set<String> tempSet = new HashSet<String>(temp);

        System.out.println("getData "+tempSet);

        Set commonKeys = new HashSet(AMap.keySet());

        ArrayList<String> ruleGroupIds = new ArrayList<String>(commonKeys);

        commonKeys.retainAll( tempSet );

 	    System.out.println(commonKeys);

	 	for (Object key : commonKeys) 

	     {

		      ArrayList<String>  value = (ArrayList<String>) AMap.get(key);

	 	      ruleGroupIds.addAll(value);

  	     }

	 	System.out.println("result " + ruleGroupIds);

 	    return ruleGroupIds;

	}

	public static void main(String args[])

	{

		ArrayList<String> compareList = new ArrayList<String>();

		compareList.add("A");	compareList.add("B");	compareList.add("D");

		ArrayList<String> superList = new ArrayList<String>();

		ArrayList<String> ruleGroupIds = new ArrayList<String>();

		ArrayList<String> ruleGroupIdsss = new ArrayList<String>();

		ruleGroupIdsss.add("1234");ruleGroupIdsss.add("12345");

		superList.add("A");superList.add("B");superList.add("C");superList.add("E");//superList.add("D");
 

		HashMap<String, ArrayList<String>> hm = new HashMap<String, ArrayList<String>>();

		hm.put("B",ruleGroupIdsss);hm.put("D",ruleGroupIdsss);hm.put("A",ruleGroupIdsss);hm.put("E",ruleGroupIdsss);

		hm.put("C",ruleGroupIdsss);

		

		test5 t = new test5();

		t.getData(hm, compareList);

	}

}

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Question by:satyabrata25
1 Comment
 
LVL 3

Accepted Solution

by:
serrutom earned 250 total points
Comment Utility

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Set;
 

public class Test5 {

	public static void main(String args[]) {

		ArrayList<String> listA = new ArrayList<String>();

		listA.add("A");

		listA.add("B");

		listA.add("D");
 

		HashMap<String, String> listB = new HashMap<String, String>();

		listB.put("A", "Test A");

		listB.put("B", "Test B");

		listB.put("C", "Test C");

		listB.put("D", "Test D");

		listB.put("E", "Test E");
 

		Test5 t = new Test5();
 

		List<String> newList = new ArrayList();

		Set<String> keys = listB.keySet();

		for (String key : keys) {

			if(listA.contains(key)) {

				newList.add(listB.get(key));

			}

		}

		

		for(String s : newList) {

			System.out.println(s);

		}

	}

}

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